Selecting switch for use in telephone systems



Apr. 3, 1923. 1,450,352 K. BOHME SELECTING SWITCH FOR USE IN TELEPHONE SYSTEMS Filed Nov. 5, 1922 I 2/ 5 d 7 A 9 1 T f O A; I a X Z h nu 5nTUr'- Km Efihme 20 crease the height of the switch.

Patented Apr. 3, 1923.

KURT BSH'ME, OF BERLIN-SIEMENSSTADT, GERMANY, ASSIGNOR TO SIEMENS &

HALSKE AK'IIENGESELLSCHAFT, OE VVERNERWERK, SIEMENSSTADT BEI BER- LIN, GERMANY.

SELECTING SWITCH FOR USE IN TELEPHONE SYSTEMS.

Application filed November To all whom it may concern.

Be it known that I, KURT Bonnie, a German citizen. and a. resident of Rohrdainm 24., Berlin-Sieniensstadt, Germany, have invented certain new and useful Improvements in Selecting Switches for Use in Telephone Systems (for which I have filed an application in Germany, July 18, 19:21, application No. S 556,999, VIII/21. a3), of which the following is a specification.

The present invention relates to selecting devices such as are used for instance in automatic telephone systems. It relates more particularly to automatic switches having a set of wipers which are adapted to be set onto any desired sets of bank contacts by means of a longitudinal and a rotary move ment.

The main object of the invention is to de- A further object is to prevent the switch shaft being subjected to shocks during the lifting mo tion, and at the same time to render the movable parts of the switch as light as 2 possible.

According to the invention this is achieved by providing the switch with separate memhers, by which the lifting and rotary movements of the switch wipers are effected, the member for efiecting the lifting movement lying within the limits of the wipers and having a length approximately equal to the distance between the wipers.

A feature of the invention is that the lifting member may be coupled with a special lever, having one end mounted lndependently of the shaft and the other end ar ranged to slide over the shaft.

The drawing shows two methods of carrying out the invention, only those parts of the apparatus being shown that alfectthe present invention. Similar parts are given the same reference characters in the two figures.

In Figure 1 the lifting member comprises a bar mounted on supports that slide on the shaft.

In Figure 2 the lifting member is located at one end of a lever having the other end pivoted on the frame work.

The automatic switch shown in Figure 1 has a-shaft a mounted in the framework ya so as to be rotated step by step by the cog wheel 6 operated by a pawl 0 which is con- 3, 1922. Serial No. 598,724.

' trolled by an electromagnet that effects the rotary movement of the selecting device. The switch has three double wipers e, spaced apart so that each has access to a separate bank of contacts. The wipers are mounted on a plate (5 of a carrier 7 which can slide on the shaft a and between the prongs of the forked member 9 which is adjustably fixed to the shaft by means of screw g, and thus serves as a flexible coupling whereby the wipers are rotated during the rotary movement of the shaft.

. lVhen it is desired to accurately adjust the wipers, so that they stand centrally on the first bank contacts, it is merely necessary to loosen the screw 9, and when the adjustment has been made the screw is again tightened. This procedure can also be adopted when the size of the switch bank field is altered.

The carrier supporting the wipers e is raised by a lifting member, which comprises a toothed bar 7L having arms '5 which, when they slide over the shaft or, impart a longitudinal movement to the carrier and thus to the wipers e. The bar 71 can be raised step by step by the pawl 7:: and has its movement controlled by a holding pawl s and a guiding fork m, the latter serving to prevent any rotation of the bar it.

In order to assist the lifting bar it, which is of slender construction, to return from the operated position into the normal position, the bar is coupled with the lever 12, which is controlled by a spring 0 operating in opposition to the lifting movement. The lever a also serves to operate the off normal contact as.

The lifting member It proximately equal to the distance between the outer wipers 6. It is mounted on the shaft at approximately inside the space formed by the outer wipers.

In Figure 2 an arrangement is shown in which the length of the lifting member is approximately equal to the distance between adjacent wipers.

This device differs from that shown in Figure l in that the shaft a carries at its lower end the switch wheel I), which is rotated step by step by the pawl c. The lifting member consists of a toothed segment .2 located at one end of a lever n. which is pivoted on an axis y and is coupled with a has a length apsleeve 71, the ends 2' of which serves to move the carrier f along the shaft a, when the segmentis raised step by step by the lifting pawl k with the co-operation of the holding pawl s. The sleeve has a portion cut away so as to clear the fork g, which is fixed to the shaft and serves to rotate the carrier 7' and thus also the wipers e.

The lever 77, is provided with a spring 0 for reliably returning the lifting member to its normal position, It also operates the off normal contacts av.

\Vhat I claim and desire to protect by Letters Patent is 1. In an automatic switch, a rotatable shaft, a wiper carriage slidably mounted on said shaft, a toothed ratchet for moving said carriage along the shaft, and means slidably supporting said ratchet on the shaft directly opposite the normal position of said carriage.

2. In an automatic switch, a rotatable shaft, a wiper carriage slidably mounted on said shaft, a. toothed ratchet for moving said carriage along the shaft, and means slidably supporting said ratchet on the shaft with all the teeth thereof beween the upper and lower wipers.

3. In an automatic switch, a rotatable shaft, a wiper carriage slidab'ly and rotatably mounted on said shaft, a ratchet for moving said carriage along the shaft also slidably and rotatably mounted on said shaft, means attached to the frame of the switch for preventing rotation of said ratchet when the shaft is rotated, and means attached to the shaft for causing said carriage to rotate with the shaft.

4. In an automatic switch, a rotatable shaft, a wiper carriage slidably and rotatably mounted on said shaft, a ratchet for moving said carriage along the shaft also slidably and rotatably mounted on said shaft, means attached to the frame of the switch for preventing rotation of said ratchet when the shaft is rotated, an arm attached to the shaft for causing said 11th day of October, 1922.

means of two horizontal members having openings at the ends through which the shaft passes, a ratchet disposed parallel to said shaft on the side opposite said wiper support, said ratchet also mounted on the shaft by means of two horizontal members having openings at their ends through which the shaft passes, the said members associated with the ratchet being disposed one above and one below the members associated with the wiper support, stepping mechanism for operating said ratchet to lift said wiper sup port by means of the two lower horizontal members, and means for rotating the shaft and wiper support independent of said ratchet.

7. In an automatic switch, a vertical shaft having a rotary movement only, a wiper support having both vertical movement and rotary movement, a toothed ratchet having a vertical movement only, said ratchet being disposed throughout its length adjacent the same portion of the shaft as the said support, means for driving the ratchet to lift said wiper support, and ,means for turn ing said shaft to rotate said'wiper support.

Signed by me at Berlin, Germany, this KURT BGHME. In the presence of KARL GIESE, O'r'ro RINKOW. 

